Combination lock



FIG. 1 is a front perspective view of the combination lock showing my new design;

FIG. 2 is a front view of the combination lock of FIG. 1;

FIG. 3 is a left side view of the combination lock of FIG. 1;

FIG. 4 is a top plan view of the combination lock of FIG. 1;

FIG. 5 is a rear view of the combination lock of FIG. 1;

FIG. 6 is a right side view of the combination lock of FIG. 1; and,

FIG. 7 is a bottom plan view of the combination lock of FIG. 1.

The portions shown in broken lines form no part of the claimed design. 

The ornamental design for combination lock, as shown and described. 